After to their support line, they were saying the boot_dev was rz19
which is dkc300...

Explained the controller/scsi sequencing...

dk      a       0 1 2 3 4 5 6 7
        b       8 9 10 11 12 13 14 15
        c       16 17 18 19 20 21 22 23
        d       24 25 26 27 28 29 30 31
        e       32 33 34 35 36 37 38 39